Please remove the checks you have in your plugin to provide for updates.

We do not permit plugins to phone home to other servers for updates, as we are providing that service for you with WordPress.org hosting. One of our guidelines is that you actually use our hosting, so we need you to remove that code.

When you've corrected your code, reply to this email with the updated code attached as a zip, or provide a link to the new code for us to review.